[Sam Wycombe]

So, this worked:

if (a>0 && a<90) {
linear(a,0,90,0,-x);
} else if (a>90 && a<180) {
linear(a,90,180,-x,0);
} else if (a>180 && a<270) {
linear(a,180,270,0,x);
} else if (a>270 && a<360) {
linear(a,270,360,x,0);
}

Obviously a java thing I missed…